Controlling device for jacks.



I. E. HINDMAN & J. VAN HA-MERSVELU.

' comnoume DEVICE FOR JACKS.

APPLICATION FILED Ill-16.6I I911.

1,261,531. Patented Apr. 2, 191&

. 2 SHEETS-SHEET I.

. 9 I I I I n m 8 I. E. HINDMAN & 1. VAN HAME RSVELD. CONTROLLINGDEVICEFOR JACKS.

APPLICATION FILED DEC- 6, 917- Patentd. v 2,1918.

2 SHE HEET 2.

F' .6. 2 ffl W7 nnrrn srarns rnrn'r onnrcn ISAIAH HINDMAN, 0F BEIiLEVUE,AND JOHN VAN HAMEBSVELD, OF AVALON, PENN- SYLVANIIL ASSIGNOB S TO THEDUFF MANUFACTURING COMPANY, OF NORTH SIDE, PITTSBURGH, PENNSYLVANIA, A.CORPORATION OF PENNSYLVANIA.

CONTROLLING DEVICE FOR JACKS.

Specification of Letters Patent.

Patented Apr. 2, 1918.

Application filed December 6, 1917. Serial No. 205,726.

To all whom it may concern:

Be it known that we, ISAIAH E. HIND- MAN and JOHN VAN HAMnRsvnLn, bothcitivices for Jacks, of which the following is a full, clear, and exactdescription, reference being had to the'accompanying drawings, formingpart of this specification, in which Figure 1 is a vertical sectionthrough one form of jack showing our improved controlling device.

Fig. 2 is a sectional view of the bearing plug for the operating pinionshaft.

big. 3 is a perspective view of one of the nut shafts and its securingdevice.

big. 4 is a face View of the movable clutch member.

Fig. 5 is a face view and a sectional view of one of the sleevecushioning spring disks.

Fig. 6 is a sectional View of a portion of the device shown in Fig. 1 ona larger scale;

and

Fig. 7 is a sectional view on the line VII--VII of Fig. 6.

This invention relates to an improvement in controlling devices forjacks, and is designed to provide a cheap and efficient dc: vice of thischaracter for controlling the extent of movement of the lifting bar ofthe 'ack.

J The object of our invention is to provide a device of this characterwhich will prevent the rotation of the lifting screw or the furthermovement of a lifting bar after it has moved below a predetermineddistance in order to prevent injuring any parts of the -jack by movingthe lifting member beyond the safety point.

We have shown our invention applied to a lifting jack of the screw type,in which the lifting member is elevated by means of a screw, and whichlifting member is prevented from rotating by means of a key, themechanism being so arranged that after the lifting member has beenelevated to a predetermined point, the ratcheting mechanism for thescrew will be locked to the screw operating ,shaft, so that theoperating shaft will be oscillated in both directions when the socketlever is operated.

- n 'e 011 in en ion The areclse 111111 of i v t will be best understoodby reference to the accompanying drawings, which will now be de scribed,it being premised, however, that various changes may be made in thedetails of construction and the general arrangement of the parts,without departing from the spirit and scope of our invention as definedin the appended claims.

Referring to the accompanying drawings, the reference character 2designates the casing having a bottom plate 3 connected thereto.Slidably mounted within this casing 2 is a lifting member l, having alifting head 5. This lifting member is provided with akey-way 6 which isengaged by a key 7 seated in a key seat in the casing 2, the arrangementbeing such that the lifting memher 4 can be raised and lowered but isprevented from rotation with relation to the casing 9.. Connected to thelifting member 4 is a nut 8, which is engaged by the threads of anelevating screw 9. Connected to the screw 9 is a bevel gear 10, which issupported on a ring 11 which forms the upper part of a ball-bearing 12for the screw. The

side of the casing 2 is provided with a screwthreaded opening for thereception of a bushing 13, having a bearing sleeve 1 1 in which isrotatably mounted the operating shaft 15. Connected to this operatingshaft 15 is a bevel gear 16 which meshes with the bevel gear 1O fortransmitting the motion from the shaft 15 to the screw 9.

Connected to the end of the shaft 15, so as to rotate therewith, is aratchet wheel 17' which is actuated by means of a pawl 18 mounted in alever socket 19. This lever socket is mounted on a shaft 15 in the usualmanner, so that when operated in one direction the screw shaft will berotated and when moved in the reverse direction the pawl will move idlyover the teeth of the ratchet-wheel 17 The bushing 13 is provided withtwo threaded sleeves 20 diametrically opposite to each other and whichare arranged to rotate therein. The threads in ner, but in the,construction shown in the drawings, one end of each of the shafts isoctagonal and is seated in a similar shaped opening in a threaded plugThe shouldered ends of the shafts abut against the plugs, the outer endsthereof being peened over to securely fasten them to the plug members.These shafts may be further secured by driving pins through the plugmembers and the ends of the shaft as indicated at 23. These plug membersare threaded into openings in the bushing 13, so that the shafts will beconcentric with their respective threaded openings. rounding each ofthese shafts, and interposed between the sleeve 20 and the'screw plug,is a spring disk 24: which acts as a cushion for the sleeve, asindicated in Figs. 1 and 6,

Mounted on a polygonal portion 25 of the shaft 15, in such a manner asto be rotated therewith, and at the same time slide longitudinallythereon, is a clutch plate 26 which is arranged to be normally held inthe position shown in Figs. 1 and 6 by means of a spring 27 surroundingthe shaft. 28 are clutch teeth connected to the plate 26, and which arearranged to engage similar clutch teeth 29011 the lever socket 19.tolock the lever socket to the shaft 15 when the plate is moved scribed.

One end of each of the threaded sleeves 20 is provided with a pinion 30which is in to the right as hereinafter de- I mesh with a gear 31 on thepolygonal portion 25 of the shaft 15, the arrangement being such thatthe threaded sleeves 20 will be rotated when the shaft 15 is rotated.

The operation of the device is as follows:

Assuming the parts to be in the position shown in Figs. 1 and 6, and inwhich the nut 8 is in its lowermost position, while the nuts 20" are attheir extreme left positions, the lever socket is now operated to rotate.the screw 9 step by step to raise the nut 8 together with the liftingmember 4: to raise the load, and during this step by step motion thenuts 20 will gradually be moved to the right along their shafts 21. Justprior to the time that the lifting member 4: will be elevated to a pointwhere its end would pass the lower end of the key 7, the nuts 20' willengage the clutch plate 26. and move it to the right so that the clutchmembers 28 thereon will engage the clutch members 29 on the lever socket19. This movement of the clutch members into engagement with each otherwill lock the lever socket to the shaft 15, so that when the socketlever is moved upwardly the shaft 15 will be moved therewith,and-thereby prevent any further step by step movement of the elevatingscrew 9-, and prevent moving the lifting member 4 to a point of danger,or a point where there would be insutficient length of bearing surfacebetween the lifting member and the casing.

Sur-

' nearest In the drawings we have shown a wellknown type of jack, inwhich we have merely removed the bearing sleeve for the, operating shaftand inserted a new bearing sleeve, together with the operating mechanismin place thereof. By this arrangement we are enabled to readily applyour invention to old jacks.

The advantages of our invention result from the provision of acontrolling device for jacks, in which the step by step actuat ingdevice islocked to the lifting bar of the mechanism therefor, so thatthe lifting bar will be raised and lowered with the operat ing mechanismor socket lever.

TV e claim:

l. A device of the character described, comprising a jack operatingshaft, an operating wheel connected to the shaft, means freely movableon the shaft and arranged to actuate the operating wheel, a clutchdevice for locking the operating device to the shaft, and clutchshifting means arranged to be shifted after the shaft hasbeen moveda'predetermined distance to lock the shaft operating means to the shaft,substantially as described.

2. A device of the character described, comprising a jack operatingshaft, a ratchet wheel on said shaft, an oscillating lever on the shaft,a pawl on said. lever for engagement with the ratchet wheel, a clutchdevice, and clutch shifting means arranged to be shifted after the shafthas been moved a predetermined distance to lock the shaft to the lever,substantially as described.

I '3. A device of the character described, comprising a jack operatingshaft, means for operating the shaft in one direction to actuate thejack, a clutch device for locking 105 the shaft operating means to theoperating shaft, and clutch shifting means arranged .to be shifted afterthe shaft has been moved a predetermined distance to lock the shaftoperating means to the shaft, substantially no as described.

.t. A device of the character described, comprising a jack operatingshaft, means for operating the shaft in onevdirection to actuate thejack, a clutch device for locking the shaft operating means to theoperating shaft, clutch shifting means arranged to be shifted after theshaft has been moved a predetermined distance to lock the shaftoperating means to the shaft, and gearing interposed between the clutchshifting means and the'shaft, substantially as described.

5. A device of the character described, comprising an operating shaftfor the jack, ratcheting mechanism for moving the shaft step by step, aclutch having a movable member for locking the ratchet mechanism to theshaft, and clutch shifting mechanism connected to the shaft and arrangedto-shift a predetermined distance; substantially as described.

6. A device of the character described comprising a shaft for actuatingthe jack, a lever socket connected thereto and arranged to move theshaft step by step, a

clutch member connected to the lever socket, a movable clutch memberconnected to the shaft, a spring for holding the movable clutch memberout of engagement with the clutch on the lever socket, a plurality ofthreaded sleeves, a nut in each sleeve arranged to engage the movableclutch member to move it into engagement with a clutch member on thelever socket, and means connected to the shaft for rotating said sleevesto shift the nuts and cause them to shift the movable clutch member intoengagement with the clutch member on the lever socket after the shafthas beenmoved a predetermined distance; substantially as described.

7. A device of the character described, comprising an operating shaft,means for operating the shaft in one direction, a clutch device slidablymounted on the shaft for locking the shaft operating means to the shaft,a rotary sleeve, actuating connections between the rotary sleeve and theshaft, and a nut having a screw-threaded connection with the sleeve andarranged to be moved relative thereto to move the clutch member afterthe shaft has been moved a predetermined distance, substantially asdescribed.

8. A clutch device of the character described, comprising a rotaryshaft, a'nactuating member for the shaft, a clutch arranged to connectsaid actuating member with the shaft, a plurality of internally threadedsleeves, a gear wheel connected to the shaft, gear wheels on saidsleeves meshing with the gear wheel on the shaft, and a threaded nut ineach of the sleeves arranged to be moved thereby to shift the clutchmember, substantially aS described.

9. A clutch device of the character described, comprising a rotaryshaft, an actuating member for the shaft, a clutch arranged to connectsaid actuating member with the shaft, a plurality of internally threadedsleeves, a gear wheel connected to the shaft, gear wheels on saidsleeves meshingwith the gear wheel on the shaft, a threaded nut in eachof said sleeves arranged to be moved thereby to throw the clutch, andspindles on which said nuts travel arranged to prevent them fromrotating with the sleeves, substantially as de- 4 scribed.

In testimony whereof, we have hereunto set our hands. ISAIAH E. HINDMAN.

JOHN VAN HAMERSVELD.

